Answer:
the answer is D.
Explanation:
Acceleration means you can increase in speed, decrease in speed, and change directions. BUT, velocity means speed with a direction. If you want to accelerate, it's impossible to keep the same velocity at the same time.
Justine is ice-skating at the Lloyd Center. What is her final velocity if she accelerates at a rate of 2.0 m/s for 3.5 seconds?
Answer:
7 m/s
Explanation:
Acceleration, [tex]a=\frac {v-u}{t}[/tex]
Where v and u are the final and initial velocities of the Justine respectively, t is the time taken for Justin to attain final velocity.
Making v the subject then
v=at+u
Taking u as zero then
Substituting 3.5 for t, 2 as a then
v=3.5*2=7 m/s
You push a loaded shopping cart 5 meters along the ground with a force of
200 N. What work have you done on it?
O A. 9,000 j
O B. 2,500 j
O C. 2003
O
D. 1,000 J
Answer:
D
Explanation:
Work done w = force F × distance d
F = 200N and d = 5m
: w = 200 × 5
w = 1000J
A ball with 100 J of PE is released from a height of 10 m. What will be the KE of the ball at 5
m?
Answer:
The kinetic energy is: 50[J]
Explanation:
The ball is having a potential energy of 100 [J], therefore
PE = [J]
The elevation is 10 [m], and at this point the ball is having only potential energy, the kinetic energy is zero.
[tex]E_{p} =m*g*h\\where:\\g= gravity[m/s^{2} ]\\m = mass [kg]\\m= \frac{E_{p} }{g*h}\\ m= \frac{100}{9.81*10}\\\\m= 1.01[kg]\\\\[/tex]
In the moment when the ball starts to fall, it will lose potential energy and the potential energy will be transforme in kinetic energy.
When the elevation is 5 [m], we have a potential energy of
[tex]P_{e} =m*g*h\\P_{e} =1.01*9.81*5\\\\P_{e} = 50 [J]\\[/tex]
This energy is equal to the kinetic energy, therefore
Ke= 50 [J]
how to do this question
Answer:
64°
Explanation:
The triangle is an isosceles triangles (both legs are equal to the radius of the circle), so that means the base angles are the same.
Angles of a triangle add up to 180°, so:
128 + 2x = 180
2x = 52
x = 26
∠1 is complementary to the base angle, so:
∠1 = 90 − 26
∠1 = 64
How does direct current differ from alternating current?
Answer:
a direct current goes in one direction at all times whereas an alternating current goes back and forth in a circuit
Which of the following is evidence that supports the particle model of light
Answer:
White light disperses into full spectrum of color when shined through a prism due to refraction.
Explanation:
This experiment was performed by Isaac Newton when he passed a white light through a glass prism.
A 68 kg rock climbers 320 m above the ground the sun is down or up at 1.5 m/s using the ground as a reference point determine the total mechanical energy of
Using the ground as a reference point the total mechanical energy of the rock climber is 213,621.15 J.
The total mechanical energy of the rock climber is the sum of its potential energy and kinetic energy. Potential energy is the energy an object has due to its position, while kinetic energy is the energy an object has due to its motion.
To calculate the potential energy, we can use the following formula:
PE = mgh
where:
PE is the potential energy (joules)
m is the mass of the object (kilograms)
g is the acceleration due to gravity (9.81 m/s²)
h is the height of the object above the ground (meters)
To calculate the kinetic energy, we can use the following formula:
KE = 1/2mv^2
where:
KE is the kinetic energy (joules)
m is the mass of the object (kilograms)
v is the velocity of the object (meters per second)
Plugging in the values, we get:
PE = (68 kg)(9.81 m/s²)(320 m) = 213,542.4 J
KE = 1/2(68 kg)(1.5 m/s)² = 78.75 J
Therefore, the total mechanical energy of the rock climber is:
ME = PE + KE = 213,542.4 J + 78.75 J = 213,621.15 J
So the answer is 213,621.15 J
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Complete question below:
A 68 kg rock climber is 320 meters above the ground and is moving upward at a speed of 1.5 m/s. Using the ground as a reference point, determine the total mechanical energy of the rock climber.
A car has a velocity of 26 m/s and goes down to 8 m/s as it approaches traffic. Was the some sort of acceleration?
Your answer:
Yes
No
Maybe so
Answer:
Yes
Explanation:
This is negative acceleration, also known as deceleration where the speed is reduced from high to low at a specific duration.
How hot is the sun in degrees Celsius?
Answer:
The temperature of the mantle varies greatly, from 1000° Celsius near its boundary with the crust, to 3700° Celsius
hope this helps you!
Final answer:
The Sun has a surface temperature of about 6000 Kelvin, which corresponds to approximately 5727 degrees Celsius. This temperature is much cooler than the Sun's core, which reaches about 15 million degrees Celsius.
Explanation:
Temperature of the Sun
The temperature on the surface of the Sun is approximately 6000 Kelvin (K), which is equivalent to about 5727 degrees Celsius (°C). At its core, the Sun is much hotter, with temperatures around 15 million degrees Celsius. The vast difference in temperature between the Sun's surface and its core can be attributed to the complex nuclear reactions and intense pressures found at the center of this stellar body.
The Sun appears somewhat yellow from Earth due to the scattering of shorter blue wavelengths by nitrogen molecules in our atmosphere, while in space, the Sun would actually look white due to the equal amounts of reddish and bluish light it emits. Students often compare the temperature of the Sun to extreme temperatures on Earth, like the record high in Death Valley, CA, which was 134°F (or approximately 56.7°C).
If you're interested in the conversion between different temperature scales, remember that 0 degrees Celsius is equal to 32 degrees Fahrenheit. The formula to convert from Kelvin to Celsius is C = K - 273.15. Therefore, the Sun's surface temperature in Kelvin can be converted to Celsius by subtracting 273.15 from the Kelvin value.
how does earths movement through space impact the human experience
Answer:
In space, astronauts lose fluid volume—including up to 22% of their blood volume. Because it has less blood to pump, the heart will atrophy.Under the effects of the earth's gravity, blood and other body fluids are pulled towards the lower body.
Explanation:
What determines how the plates interact at their boundaries
Answer:
Tectonic plate interactions are of three different basic types: Divergent boundaries are areas where plates move away from each other, forming either mid-oceanic ridges or rift valleys. These are also known as constructive boundaries. Convergent boundaries are areas where plates move toward each other and collide.
Explanation:
Meaning the answer to your question is depending on what type of tectonic plate interaction is occurring will depend on how the plates interact.
The greater the speed of speed gas particles in containers, the
Greater the collision
Explanation:
The greater the speed of gas particles in the containers, the greater the collision of gases with the container and between themselves.
The speed of gas molecules increases when their kinetic energy increases. This causes a surge in collision between the particles and the wall of the container. A gas is composed of large number of molecules moving at different speeds. When the temperature of gases are increased, they gain more kinetic energy and their speed will increase. This leads to an increase in effective collision between gas particles.Learn more:
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why do many species that existed 35 million years ago no longer exist
Answer:
There are several reasons for the extinction of species. Some of these can include climate change, natural disasters, environmental destruction, or over-hunting. All of these factors can contribute to the deaths of various animals which ultimately leads to extinction if left unchecked.
Explanation:
A city is considering switching to geothermal power for their electricity needs. Which of the following is an advantage of this plan?
It is commonly used across the entire United States.
It uses less land area than gas power plants.
It uses water to power large turbines.
It in inexpensive to build.
It uses water to power large turbines.
Geothermal power taps on the energy of natural steam from the earth's lithosphere.
Explanation:
The heat from deep in the the lithosphere heats up underground water into high-pressure steam trapped in within the rocks. Boreholes are sunk to tap on the potential energy of this high-pressure steam to turn large dynamo turbines that convert the steam energy into electricity.
The biggest advantage, moreover, is the fact that this method of electricity generation does not emit greenhouse emissions as compared to gas plants that burn hydrocarbons that release CO₂.
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is potential energy a vector or scalar quantity
Answer:
Scalar Quantity
Explanation:
Scalar Quantity
Quantity whose magnitude alone is sufficient to represent it. We can also say that it is an amount that has magnitude but no direction. For example, temperature and volume are scalar quantities.
For this case we have the potential energy and it is defined by the equation:
[tex]E_{p}=m*g*h\\ where:\\m =mass [kg]\\g = gravity [m/s^2]\\h = height [m]\\[/tex]
The above equation only shows us one magnitude, it has no direction, therefore it is a scalar quantity.
HELP WILL GIVE BRAINLIEST
Answer:
The answer is 8 [gr/cubic centimeter]
Explanation:
We know that the definition of the density is defined by the mass of the object or substance divided by its volume.
Therefore:
[tex]density=mass/volume\\mass= gramms, kilograms, pounds\\volume=cm^3, m^3, liters, gallons\\[/tex]
For this problem:
[tex]density =\frac{12}{1.5} \\density=8[grams/cm^3][/tex]
A small ball weighs 1.4 N.
gravitational field strength, g = 9.8 N / kg
Calculate the mass of the ball.
Answer:
0.14 kg
Explanation:
Weight is the mass of an object times the gravitational field strength.
w = m(9.8)
1.4 = m(9.8)
1.4/9.8 = 9.8m/9.8
.14 = m
Final answer:
To find the mass of the ball, the weight is divided by the gravitational field strength, resulting in a mass of 0.143 kg.
Explanation:
To calculate the mass of the ball, we can use the formula for weight (w), which is the gravitational force on mass (m):
w = mg.
Given that the weight (w) of the ball is 1.4 N and the gravitational field strength (g) is 9.8 N/kg, we can rearrange the formula to solve for mass (m):
m = w/g
Plugging in the known values, we get:
m = 1.4 N / 9.8 N/kg = 0.143 kg.
The mass of the ball is therefore 0.143 kilograms.
if a ball is thrown with a velocity of 25 m/s at an angle of 37 degrees above the horizontal,evaluate the projectile for it's horizontal component of the velocity
Answer:100 mph
Explanation:
When an object is thrown in a trajectory path the motion is called projectile motion. The horizontal component for the given projectile motion is 15.04 m/s.
From the projectile motion:[tex]V_x = u\rm \ sin{\theta}[/tex]
Where,
[tex]V_x[/tex] - Velocity in the X-axis
[tex]u[/tex]- initial velocity =25 m/s
[tex]\theta[/tex] = angle of throw = 37 degrees
Put the values in the formula,
[tex]V_x = 25\rm{\ sin} \ 37^o\\\\\it{ V_x} = \rm 25\rm \times -0.64\\\\\it {V_x} = \rm 15.04 \rm \ m/s[/tex]
Therefore, the horizontal component for the given projectile motion is 15.04 m/s.
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Heat will flow from object A to object B if:
1 The molecular average kinetic energy of the two objects is the same.
2 The molecular average kinetic energy of A is higher than that of B.
3 The molecular average kinetic energy of B is higher than that of A.
I only
II only
I and III
III only
Answer:
l and lll
Explanation:
Answer:
II only
Explanation:
For heat to flow from one object to another, there must be a temperature difference between them. Temperature is a measure hotness or coldness of an object or a body.
An object consists of vibrating molecules, thus molecular kinetic energy. The measure of the average kinetic energy of an object is its temperature. Thus, when object A has higher temperature (hotter) than B, heat would flow from A to B.
How does the gravity which pulls the moon and earth toward each other also affect the ocean?
the ocean creates tides accosiated with the ocean
In a car crash inertia could cause you to crash into a windshield
Answer:
yes inertia would cause you to crash into the windshield in an accident
A sound has 13 crests and 15 troughs in 3 seconds. When the second crest is produced the first is 2cm away from the source? Calculate
a. The wavelength
b. The frequency
c. The wave speed
Answer:
The wavelength will be 4 cm, frequency will be 4.66 Hz and wave speed is 18.6 cm/sec
Explanation:
Given:
No. of crest = 13
No. of trough = 15
Time = 3 seconds
Hence, 1 crest or 1 trough = [tex]\frac{1}{2}\lambda[/tex]
therefore,
13 C + 15 T = [tex]28(\frac{1}{2}\lambda)[/tex]
=[tex]14\lambda[/tex]
Time given 3 seconds
= [tex]\frac{3}{14}s[/tex]
[tex]\nu= \frac{14}{3}[/tex]
[tex]\nu= 4.6 Hz \approx 5 Hz[/tex]
2 cm distance is travelled is time period
[tex]\lambda = 4 cm[/tex]
Again wave will travel in 1 T = 4 cm
wave speed v =[tex]\lambda\times\nu[/tex]
= [tex]4\times\frac{14}{3}[/tex]
= 18.6 cm/s
a 1 m length of string is wrapped around a solid disk, of mass .25 kg and a radius of .30m, mounted on a frictionless axle. the string is pulled with a tension force of 20 N. what is the angular velocity of the disk after the string is pulled off
Answer:
60 rad/s
Explanation:
∑τ = Iα
Fr = Iα
For a solid disc, I = ½ mr².
Fr = ½ mr² α
α = 2F / (mr)
α = 2 (20 N) / (0.25 kg × 0.30 m)
α = 533.33 rad/s²
The arc length is 1 m, so the angle is:
s = rθ
1 m = 0.30 m θ
θ = 3.33 rad
Use constant acceleration equation to find ω.
ω² = ω₀² + 2αΔθ
ω² = (0 rad/s)² + 2 (533.33 rad/s²) (3.33 rad)
ω = 59.6 rad/s
Rounding to one significant figure, the angular velocity is 60 rad/s.
What is an accurate definition of a heat engine? A. a system that converts mechanical energy into thermal energy B. a system that creates thermal energy from the sun C. a system that converts thermal energy into other useful forms of energy D. a system that disperses mechanical energy into various reservoirs
Answer:
C
Explanation:
C. a system that converts thermal energy into other useful forms of energy
Answer:
The correct option is C
Explanation:
An engine is a highly organized device that converts a form of energy into another form of energy (usually mechanical energy). A heat engine is a device or an engine that converts heat (or thermal energy energy) into other useful forms of energy (usually mechanical energy). Examples of heat engine include steam engine, internal combustion engine. diesel engine among others.
Which formula correctly expresses the property density?
Question 7 options:
(A) D = m/v
(B) D = m*v
(C) D = v + m
(D) D = v/m
worth 50 points answer for 50 points and for a chance for "Brainliest" if i know answer is wrong i will remove
Answer:A
Explanation: density=mass/volume. Density is the measurement of how much mass is contained in a given volume of an object. It can also be defined as mass per unit volume. Mass is the amount of matter in an object while volume is a measure of how much space an object takes u or occupies
A sailboat accelerates from rest to a speed of 2 m/s east. Discuss direction and relative strength of the forces on the boat
Answer:
The direction of the force is towards the east.
The relative strength of the force acting on the boat is proportional to the acceleration acting on the boat.
Explanation:
Given data,
The initial velocity of the sailboat, u = 0 m/s
The final velocity of the sailboat, v = 2 m/s
Let, the time period of the sailboat to reach 2 m/s is, t = 4 s
The acceleration of the sailboat is given by the formula,
a = (v-u)/t
a = (2 - 0)/ 4
a = 0.5 m/s²
The direction of the force is towards the east.
The relative strength of the force acting on the boat is proportional to the acceleration acting on the boat.
A block of mass m = 75 kg is hanging on a vertical rope of length L = 12 m. What work is done by the
gravitational force when the block swings to a position where the rope makes an angle θ = 40° with
the vertical?
Answer:
2100 J
Explanation:
Draw a picture. Notice that the rope forms a triangle, where the hypotenuse is L and the height is L cos θ. The height of the mass is h. The total height is L, so:
L = h + L cos θ
h = L − L cos θ
The work done by gravity is force times distance:
W = mgh
W = mg (L − L cos θ)
W = (75 kg) (9.8 m/s²) (12 m − 12 m cos 40°)
W = 2063 J
Rounding to two significant figures, the work done is 2100 J.
The thin, narrow structure of the capillaries is well-suited to their function because the capillaries _____.
1. Only carry the liquid portion of blood
2. Transport substances directly to the body cells
3. Require only a small amount of oxygen to function
4. Have the opposite function of arteries and veins
4. How many planets are there in our solar system?
a. 9
b. 8
c. 12
d. 15
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Since Pluto is a dwarf planet, the correct option is B. 8
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Neutrons released in a fission reaction can strike other nuclei and cause ______.
Question 16 options:
fusion reactions
chain reactions
radioactive decay
an electron avalanche
Chain reactions
Neutrons released in a fission reaction can strike other nuclei and cause chain reactions
Explanation:
In nuclear fission reactions, the heavier atoms split into into lighter atoms, releasing neutrons at high velocity in the process. The neutrons hit other heavier atoms in the vicinity and split them too releasing more neutrons. This continuation is called chain reaction. The more the released neutrons the higher the rate of chain reactions. This causes too much energy to be produced at a go until an enormous explosion occurs (like in bombs).
In controlled nuclear fission such as in nuclear reactors, the number of neutrons is controlled so as to prevent the reactor from exploding. A wall that absorbs excess neutrons is used to control the number of chain reactions to prevent the release of too much energy at once.
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Final answer:
Neutrons released in a fission reaction can cause chain reactions, which are sustained cycles of fission that release significant amounts of energy.
Explanation:
Neutrons released in a fission reaction can strike other nuclei and cause chain reactions. This process begins when a neutron collides with a nucleus, such as uranium-235, causing it to split into two smaller isotopes and release additional neutrons. If these neutrons then collide with other uranium-235 atoms, they can cause further fission, perpetuating the cycle. A sustained nuclear chain reaction can lead to the release of large amounts of energy, which is the principle behind both nuclear power generation and the explosive power of nuclear weapons.